samus: increase stack size for PDCMD task
samus: increase stack size for PDCMD task

Increase task stack size for PD host command task to 512. The nominal
stack size is 328 / 384, which is pretty close to the edge.

BUG=none
BRANCH=none
TEST=make -j buildall

Change-Id: Ifdf04923b817c832cbb77ba7f61c06a560aec97d
Signed-off-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/217452
Reviewed-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>

fourier49/BIZ_EC,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,eatbyte/chromium-ec,eatbyte/chromium-ec,thehobn/ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,longsleep/ec,coreboot/chrome-ec,thehobn/ec,longsleep/ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,longsleep/ec,md5555/ec,longsleep/ec,thehobn/ec,fourier49/BIZ_EC,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BIZ_EC,md5555/ec,mtk09422/chromiumos-platform-ec,thehobn/ec,mtk09422/chromiumos-platform-ec,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,eatbyte/chromium-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC